How do I restore my usual Siri voice after it became high-pitched?

All of a sudden, this morning, Siri started sounding like Alvin the Chipmunk. It was kind of funny at first but now it’s just obnoxious lol. I did not change any settings. This happened overnight. I’m not sure if maybe my phone did an update last night or not? The voice is usually set to an Australian female and now it’s an American chipmunk. Please let me know what to do and also why this may have happened if anyone knows. Thank you. ALLLLVVVVIIIINNNNNNNN

[Re-Titled by Moderator]